(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

IBM

Related People

Newman, EL: AUTHOR

Abstract

Low frequency bandwidth often limits the effectiveness of a link in transmitting data, for example digital data having a DC component. Encoding such data into a series of impulses can reduce this problem, and is particularly effective when used with fibre optical communication links.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
74% of the total text.

Low frequency
bandwidth often limits the effectiveness of a
link in transmitting data, for example digital data having a DC
component. Encoding such data into a
series of impulses can reduce
this problem, and is particularly effective when used with fibre
optical communication links.

The basic
arrangement is shown in Fig. 1. Input
digital data 1
is encoded into a series of impulses 2 in a differentiator/rectifier
3. The impulses are transmitted into the
transmission medium by a
transmitting device 4, which, for an optical fibre medium, will
typically be a laser diode.

The impulses
are received by a receiving device 5, typically a
PIN diode for an optical fibre system, and converted into digital
data 7 in an integrator/switch circuit 6.

Details are
shown in Fig. 2, with associated waveforms.
A
differentiating amplifier 8 has both non-inverting and inverting
outputs connected to drive the laser diode 4.
The resulting impulses
are received by the PIN diode 5, the output of which is amplified,
applied to a filter 9 to remove noise and after shaping by a logic
shaper applied to a divide by two circuit to produce the output data.

Such a system
is adequate where the digital data is not sign
sensitive. The system may be adapted to
deal with sign sensitive
data by amplitude modulating the impulses, for example by causing
positive transition...